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iommu/vt-d: Simplify domain_remove_one_dev_info() 

Simplify this function as much as possible with the new
iommu_refcnt field.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-07-21 18:19:08 +02:00
parent 42e8c186b5
commit b608ac3b6d
1 changed files with 17 additions and 35 deletions
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52
drivers/iommu/intel-iommu.c
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@ -4610,52 +4610,34 @@ static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
static void domain_remove_one_dev_info(struct dmar_domain *domain,
struct device *dev)
{
struct device_domain_info *info, *tmp;
struct device_domain_info *info;
struct intel_iommu *iommu;
unsigned long flags;
bool found = false;
u8 bus, devfn;
iommu = device_to_iommu(dev, &bus, &devfn);
if (!iommu)
return;
info = dev->archdata.iommu;
if (WARN_ON(!info))
return;
spin_lock_irqsave(&device_domain_lock, flags);
list_for_each_entry_safe(info, tmp, &domain->devices, link) {
if (info->iommu == iommu && info->bus == bus &&
info->devfn == devfn) {
unlink_domain_info(info);
spin_unlock_irqrestore(&device_domain_lock, flags);
iommu_disable_dev_iotlb(info);
iommu_detach_dev(iommu, info->bus, info->devfn);
iommu_detach_dependent_devices(iommu, dev);
free_devinfo_mem(info);
spin_lock_irqsave(&device_domain_lock, flags);
if (found)
break;
else
continue;
}
/*
* If there is no other devices under the same iommu owned by
* this domain, clear this iommu in iommu_refcnt update iommu
* count and coherency.
*/
if (info->iommu == iommu)
found = true;
}
unlink_domain_info(info);
spin_unlock_irqrestore(&device_domain_lock, flags);
if (found == 0) {
domain_detach_iommu(domain, iommu);
if (!domain_type_is_vm_or_si(domain))
iommu_detach_domain(domain, iommu);
}
iommu_disable_dev_iotlb(info);
iommu_detach_dev(iommu, info->bus, info->devfn);
iommu_detach_dependent_devices(iommu, dev);
free_devinfo_mem(info);
domain_detach_iommu(domain, iommu);
spin_lock_irqsave(&domain->iommu_lock, flags);
if (!domain->iommu_refcnt[iommu->seq_id])
iommu_detach_domain(domain, iommu);
spin_unlock_irqrestore(&domain->iommu_lock, flags);
}
static int md_domain_init(struct dmar_domain *domain, int guest_width)